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Concentration of Credit Risk - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) Institution | Dec. 31, 2016 USD ($)
Debt Disclosure [Abstract] |  |
Uninsured cash balance | $ 800,000 | $ 1,500,000
Number of financial institutions in which cash is deposited | Institution | 1 |
Amount of loan outstanding with variable interest rate | $ 0 |

X
- Definition Number of financial institutions in which cash deposited. + References No definition available. + Details
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- Definition The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition Amount of loan with variable or adjustable rate of interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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